Parse env vars and args from debug launch editor (#30538)

Release Notes:

- debugger: allow setting env vars and arguments on the launch command.

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Co-authored-by: Cole Miller <m@cole-miller.net>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/debugger_ui/Cargo.toml

@@ -51,6 +51,7 @@ rpc.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 settings.workspace = true
+shlex.workspace = true
 sysinfo.workspace = true
 task.workspace = true
 tasks_ui.workspace = true